Ablution and Tayammum in the Quran
There are some benefits of ablution which Muslim people usually do before praying salat (namaz). The body movements of prayers (salat) have been nicely conglomerated with the benefits of both physical and spiritual exercise. Namaz (Salat) should be offered coolly, calmly, religiously and spiritually to get its maximize benefits.
Wudu (Ablution) with water where one washes his hands, face, and feet regions lead to preventing germs from the body thus promotes good health. Ablution helps to relax the nervous system and eases tension, stress and anxiety. Hand washing is an efficient way to prevent the spread of germs.
Nose cleansing during ablution removes dusts, allergens and contaminated matter. Nose cleaning with plain water helps to minimize the infections such as flu, sinusitis, cold and chest infections. Face washing during ablution is very beneficial for refreshing as well as improving the facial complexion.
Face washing reduces the impact of oily skin and retarded the growth of acne, pimples, wrinkles, and other facial spots. Washing the feet during Wuzo helps to cleaning dirt and fungus. However, I am not sure about what is the benefit of Tayammum. Anyway, the following are the verses of the Quran which talking about Ablution and Tayammum and the conditions for which these are necessary.
[The Quran 5:6] O you who believe, when you observe the Contact Prayers (Salat), you shall: (1) wash your faces, (2) wash your arms to the elbows, (3) wipe your heads, and (4) wash your feet to the ankles. If you were unclean due to sexual orgasm, you shall bathe. If you are ill, or traveling, or had any digestive excretion (urinary, fecal, or gas), or had (sexual) contact with the women, and you cannot find water, you shall observe the dry ablution (Tayammum) by touching clean dry soil, then rubbing your faces and hands. GOD does not wish to make the religion difficult for you; He wishes to cleanse you and to perfect His blessing upon you, that you may be appreciative.
[The Quran 4:43] O you who believe, do not observe the Contact Prayers (Salat) while intoxicated, so that you know what you are saying. Nor after sexual orgasm without bathing, unless you are on the road, traveling; if you are ill or traveling, or you had urinary or fecal-related excretion, or contacted the women (sexually), and you cannot find water, you shall observe Tayammum (dry ablution) by touching clean dry soil, then wiping your faces and hands therewith. GOD is Pardoner, Forgiver.